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Observation of magnetic helicoidal dichroism with extreme ultraviolet light vortices

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arxiv 2103.13697 v1 pith:J4UNAWTX submitted 2021-03-25 physics.optics

Mauro Fanciulli , Matteo Pancaldi , Emanuele Pedersoli , Mekha Vimal , David Bresteau , Martin Luttmann , Dario De Angelis , Primož Rebernik Ribič
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Benedikt Rösner Christian David Carlo Spezzani Michele Manfredda Ricardo Sousa Ioan-Lucian Prejbeanu Laurent Vila Bernard Dieny Giovanni De Ninno Flavio Capotondi Maurizio Sacchi Thierry Ruchon
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classification physics.optics
keywords magneticangulardichroismlightorbitalextremehelicoidalinteraction
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We report on the experimental evidence of magnetic helicoidal dichroism, observed in the interaction of an extreme ultraviolet vortex beam carrying orbital angular momentum with a magnetic vortex. Numerical simulations based on classical electromagnetic theory show that this dichroism is based on the interference of light modes with different orbital angular momenta, which are populated after the interaction between the light phase chirality and the magnetic topology. This observation gives insight into the interplay between orbital angular momentum and magnetism, and sets the framework for the development of new analytical tools to investigate ultrafast magnetization dynamics.

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